Recent Contributions of Theory to Our Understanding of the Atlantic Meridional Overturning Circulation
Recent Contributions of Theory to Our Understanding of the Atlantic Meridional Overturning Circulation
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DOI：
10.1029/2019jc015330
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
H. Johnson;P. Cessi;D. Marshall;F. Schloesser;M. Spall
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文献类型：
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作者：
H. Johnson;P. Cessi;D. Marshall;F. Schloesser;M. Spall
革命性的观测阵列，加上新一代的海洋和气候模式，在过去的二十年里，为大西洋经向翻转环流（AMOC）提供了新的和有趣的见解。理论模型也改变了我们对AMOC的看法，为理解新的观测结果和复杂模型的结果提供了一个动力学框架。在本文中，我们回顾了最近的进展，在概念上的理解的过程中保持AMOC。我们讨论了最近的理论模型，解决的问题，如表面浮力和风强迫之间的相互作用，在何种程度上AMOC是绝热的，中尺度涡的重要性，中深度北大西洋深水细胞和深海南极底层水细胞之间的相互作用，盆地几何形状和测深的作用，和一个三维多盆地的观点的重要性。我们回顾了高纬度北大西洋深水形成的新范例，以及纵贯混合对海洋内部垂直运动的影响。我们还讨论了我们对AMOC稳定性及其与大尺度纬向密度梯度的标度的理解的进展。沿着回顾平均AMOC的理论，我们考虑AMOC的可变性模型，并讨论我们从理论上学到的关于AMOC异常的检测和横向传播。简单的理论模型仍然是一个重要而强大的工具，用于阐明我们对AMOC的理解，并确定在下一代数值海洋和气候模式中准确表示最关键的过程。
Revolutionary observational arrays, together with a new generation of ocean and climate models, have provided new and intriguing insights into the Atlantic Meridional Overturning Circulation (AMOC) over the last two decades. Theoretical models have also changed our view of the AMOC, providing a dynamical framework for understanding the new observations and the results of complex models. In this paper we review recent advances in conceptual understanding of the processes maintaining the AMOC. We discuss recent theoretical models that address issues such as the interplay between surface buoyancy and wind forcing, the extent to which the AMOC is adiabatic, the importance of mesoscale eddies, the interaction between the middepth North Atlantic Deep Water cell and the abyssal Antarctic Bottom Water cell, the role of basin geometry and bathymetry, and the importance of a three‐dimensional multiple‐basin perspective. We review new paradigms for deep water formation in the high‐latitude North Atlantic and the impact of diapycnal mixing on vertical motion in the ocean interior. And we discuss advances in our understanding of the AMOC's stability and its scaling with large‐scale meridional density gradients. Along with reviewing theories for the mean AMOC, we consider models of AMOC variability and discuss what we have learned from theory about the detection and meridional propagation of AMOC anomalies. Simple theoretical models remain a vital and powerful tool for articulating our understanding of the AMOC and identifying the processes that are most critical to represent accurately in the next generation of numerical ocean and climate models.